That fan comes on with the a/c compressor to assist cooling while a/c is in use....diagnostics must be performed with a/c on for that fan to be energized...start at the relay in the underhood fuse/relay box and check for 12 volts to fan when a/c compressor clutch is energized

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you may have a bad fan motor that needs replacing. if you unplug the cooling fan and direct feed the motor with jumper wires and it doesn`t run then the fan motor needs replacing. this is what it sounds like as it should run when the motor gets to a certain temp or the a/c is turned on.

You will probably need to replace the resistor behind the dash. Usually the first symptom is the fan will only blow on high but not on the lower speeds. If that is the case, then the resistor ( cheap fix) is the culprit.

If you just lost it all of a sudden, you should check for a bad fuse and will probably find other things that don't work too. Replace the fuse and watch to see that it doesn't go out again - which if it does, you have a short somewhere that needs to be fixed.

With electric fans it’s almost always the fan motor. To check it run wires from the positive and negative battery posts directly to the fan motor connector. If it doesn’t run the fan motor is defective.

i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.